“Red galaxies? On a Friday night? They’re so hot and dense and full of obnoxious Level III civilizations, nobody goes there anymore.”

Colder is actually better and more fun. You see, the theoretical lower limit for how much energy your super-computer takes to run is given by temperature, and thus on a larger scale by the temperature of the background radiation in your part of the cosmos. See https://en.wikipedia.org/wiki/Landauer%27s_principle